When I read something like:

"As far as the body is concerned, stress is stress—it doesn't matter if it comes from a session of intervals or from the emotional strain of a romantic breakup, says John Kiely, an Irish sports scientist and performance coach who's worked with world- class athletes in numerous sports, including rugby and track"

it remainds me "calorie is a calorie wherever it comes from". My ass (excuse me). So "stress is stress"? I'm not sure. I can cope far better with phisical stress than with mental stress